diff --git a/sys/arm/arm/unwind.c b/sys/arm/arm/unwind.c
--- a/sys/arm/arm/unwind.c
+++ b/sys/arm/arm/unwind.c
@@ -399,6 +399,8 @@
 			return 1;
 
 		/* Update SP */
+		if (!__is_aligned(vsp, sizeof(register_t)))
+			return 1;
 		update_vsp = 1;
 
 		/* Load the registers */
@@ -431,6 +433,8 @@
 		count = insn & INSN_POP_COUNT_MASK;
 
 		/* Update sp */
+		if (!__is_aligned(vsp, sizeof(register_t)))
+			return 1;
 		update_vsp = 1;
 
 		/* Pop the registers */
@@ -461,6 +465,8 @@
 			return 1;
 
 		/* Update SP */
+		if (!__is_aligned(vsp, sizeof(register_t)))
+			return 1;
 		update_vsp = 1;
 
 		/* Load the registers */